Strong



(N0 Modl.)

' G. W. ARMSTRONG & W, A. RANKIN.

SCREEN.

' No. 419,907. Patented Jan.21, 1890.

mow/v2 072 UNITED STATES PATENT OFFICE.

- GEORGE W.'ARMSTRONG AND WILLIAM A. RANKIN, OF NEW LISBON, OHIO.

SCREEN.

SPECIFICATION forming part of Letters Patent No. 419,907, dated January21,

Application filed October 24, 1888- Serial No. 289,046. (No model.)

To all whom it may concern:

Be it known that we, GEORGE -W. ARM- STRONG and WILLIAM A. RANKIN,citizens of the United States, residing at New Lisbon, in the county ofOolumbiana and State of Ohio, have invented certain new and useful1mprovements in Screens; and we do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilledin the art towhich it appertains to make and use the same,reference being had to the accompanying drawings, and to the letters ofreference marked thereon, which form a part of this specification.

This invention relates to screens which are especially designed forscreening sand, coal, ore, &c., and has for its object to provide adevice that will not readily clog, as the substance treated will glidedown a roughened or broken incline in contradistinction to the smoothsurface of the ordinary screen; also, to provide a screen that can bemanufactured cheaply, and which will be compact, durable, and efficient.

The improvement consists in the peculiar construction and combination ofthe parts, which hereinafter will be more fully described and claimed,and which are shown in the annexed drawings, in which- Figure 1 isafront view of ascreen embodying our invention; Fig. 2, a. verticalsection, parts being broken away on the line X X of Fig. 1; Fig. 3, adetail perspective view, on an enlarged scale, of the longitudinalscreenwires; Fig. 4, a detail perspective view of a modification, andFig. 5 a side view of the interposed washers.

The frame of the screen, consisting of the head and the foot boards Aand B, respectively, and the side boards 0, is of ordinary construction.The longitudinal wires D have offsets 61 formed therein at regularintervals, which are provided with eyes at, preferably at the lower endsof the offsets. The eyes d are provided by bending the wire to form oneor more coils,which space the wires apart the required distance. Onecoil is sufficient for a fine screen and two or more for a coarsescreen. The cross-rods F, secured at their ends in the sides 0 0, passthrough the eyes of the longitudinal wires and hold them in place.

In Fig. 4 is shown a construction in which the longitudinal wires arespaced apart by the washer G,which will be of varying thickness,according to the graduation of the screen. These washers will havegrooves g in each side to receive the longitudinal wires. In this latterconstruction the longitudinal wires will not have any eyes and will fitin the grooves g in the washers simply, which grooves have their endsdisposed at an angle relative to each other to correspond with theoffsets in the said wires.

For convenience of support the screen is provided with the legsectionII, which is hinged thereto at its upper end.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is

1. The combination, with the longitudinal wires and the cross wires, ofthe washers placed between the longitudinal wires and mounted on thecross wires and having grooves to embrace the said longitudinal wires,substantially as described.

2. The combination, with the longitudinal wires having offsets formedtherein and the cross-wires arranged in the angles of the offsets, ofthe washers placed on the cross-wires and arranged between thelongitudinal wires and having grooves in their sides corresponding withand adapted to receive the oifsets in the said longitudinal wires,substantially as and for the purpose described.

In testimony whereof we affix our signatures in presence of twowitnesses.

GEORGE W. ARMSTRONG.

WILLIAM A. RANKIN.

Witnesses:

J. N. CALHOON, WILLIs J ORDAN.

